The fill factor of a solar cell

  • #1
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Homework Statement
a question about the fill factor of a solar cell
Relevant Equations
FF = Vm*Im/Voc*Isc
hi guys
for a solar cell i know that the fill factor is given by the following relation :
$$ FF = \frac{Vm*Im}{Voc*Isc}$$
but when solving the following example :
cell.png

the book used the following relation in the problem?! :
FF.png

where this Ln relation came from ?
 
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  • #2
any help on this , i just want a hint how to derive it
 

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